1. The Great Theatre of Pompeii (Teatro Grande) is one of the oldest and largest surviving Roman theatres in the world, dating back to 2nd century BC. It was mostly used for theatrical performances and could seat up to 5,000 spectators. The theatre was built in the Greek-style, with a semi-circular orchestra, a stage, and a tiered seating area. The acoustics in the theatre were also exceptional, allowing actors to be heard clearly without the use of microphones.

2. The opening hours of the Great Theatre of Pompeii may vary depending on the season, but it is generally open from 9:00 am to 5:00 pm. The phone number for the Pompeii Archaeological Site is +39 081 857 5111.

3. Tickets to the Great Theatre of Pompeii can be purchased at the entrance to the Pompeii Archaeological Site or online. The price of admission varies depending on the season and the type of ticket, but it generally ranges from €15-20 for adults and €2-€10 for children and students. Transportation to Pompeii can be done by train, bus, or car, with the closest train station being the Pompeii Scavi Villa Dei Misteri station on the Naples-Sorrento line.